In this video 2009 ADCC Champion Rafael Mendes demonstrates one of Eddie Bravo's back take tekks from Twister Side Control.
Eddie Bravo brought the Wrestler's Guillotine to BJJ and adapted it along with creating entries into the position so that it would work against an opponent that does not give you his back as wresters do when they go face down to avoid a pin.
From Twister Side Control Rafael Mendes shows how to use the Twister Roll in order to take the back. One important detail that will help tighten up the tekk is after you trap your opponent's leg you make sure to put a Lockdown on the trapped leg. This gives you more control through the roll so you are less likely to lose position.